knock around …

Từ điển Oxford Advanced Learner 8th

ˌknock aˈround… derived
(BrE also ˌknock aˈbout…) (informal)
1. to travel and live in various places
•He spent a few years knocking around Europe.
2. used to say that sth is in a place but you do not know exactly where
•It must be knocking around here somewhere.
Main entry: ↑knock_derived